Amplifier



FIG. 1 is a perspective view of an amplifier;

FIG. 2 is a right side view of the amplifier;

FIG. 3 is a left side view of the amplifier;

FIG. 4 is a front view of the amplifier;

FIG. 5 is a back view of the amplifier;

FIG. 6 is a top view of the amplifier; and,

FIG. 7 is a bottom view of the amplifier.

The broken lines shown in the figures depict the portions of the amplifier that form no part of the claimed design. 

CLAIM What is claimed is the ornamental design for an amplifier, as shown and described. 